From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45CD5C4BA24 for ; Wed, 26 Feb 2020 18:48:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1446520714 for ; Wed, 26 Feb 2020 18:48:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="JSbBnzy7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727445AbgBZSs2 (ORCPT ); Wed, 26 Feb 2020 13:48:28 -0500 Received: from mail-wr1-f74.google.com ([209.85.221.74]:53649 "EHLO mail-wr1-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727405AbgBZSs0 (ORCPT ); Wed, 26 Feb 2020 13:48:26 -0500 Received: by mail-wr1-f74.google.com with SMTP id n23so137902wra.20 for ; Wed, 26 Feb 2020 10:48:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=GUzRbTx+9+5SLlU+YVj83grWFXbPGAYyGcx3oLf377g=; b=JSbBnzy73DD7ilHDWTFrjHWPxRL7qMXhCBn/ySAMownKsqRDhzchskO8xsrPstrHmU 7hbYdvKkxGKY64y17R2D0sCyYJS97SlynEXUWo9kcZ2s1U6RnVUVAvtiSm9LJyeqcS28 gDjmCKR3o3dQoLoI9V/DGjM23yTRJ2WZEq2rwf7GIh/sjMsmJLqT1Lzns1pCU7Eh6VN7 0egGzWbctmv/nxkmUStAHcDTVvEMkg9KxCZGkwQtqxwY3WZ90B16QfBlliEhPh5ALjn4 ObyBYLTt1rSpfvp+CyeQpsNQgBNwLgnKWznE18PjeO/LJ5v5C1Yu8jaNW1CH1JnjGaD5 3egg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=GUzRbTx+9+5SLlU+YVj83grWFXbPGAYyGcx3oLf377g=; b=C0rTh5dGtoPs+JT5LAOJotl8sF5BpdrOp+MDXvwSRoij0ZU5ROnIIh5d+psBBLJOwc mnToxVnPwYMj7anMUo13AU0YT0XyoDBb3NtuyKHIWs0DA+241zo2UswwbNjQCafHDDtY fNl2qSn3CnCPF5dlreZMx3KWv1gxHptbh+vqfXcqfQjVJdRfJUpWoNxMasOs4wTiWR2t W5bSpw8l/GGKeR4SdETc+zDl9O4SYatTRjLZm5mXORCAStdgA9Xdk3iTBTGLKGFyFDDd cvbpfZP2hChC/wwnXU3Qi7IuAkb78Wz7ZeBuznLUHfYuaxeZTZV4EUipKni+RXgZy8hJ 8+qA== X-Gm-Message-State: APjAAAX1YnlALAcp6mNX7QEl3Pp9ZBwy8x3aC1lkxtbT1CTlNLM6wtLw KD6WLK9pDnlWBfe4hZuK3gij8IMwEjxKTEyc X-Google-Smtp-Source: APXvYqy+464jcwq7XNRH9yunMmB1w1Y35nJInpXA1U7aPORosC3hZ+1ZSK+jy5xDoiJde55La6FlNSHVBCJ5D74Q X-Received: by 2002:adf:eac1:: with SMTP id o1mr48952wrn.234.1582742902870; Wed, 26 Feb 2020 10:48:22 -0800 (PST) Date: Wed, 26 Feb 2020 19:48:09 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.25.1.481.gfbce0eb801-goog Subject: [PATCH v1 3/3] usb: core: kcov: collect coverage from usb complete callback From: Andrey Konovalov To: Dmitry Vyukov , Greg Kroah-Hartman , Alan Stern Cc: Andrew Morton , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Potapenko , Marco Elver , Andrey Konovalov Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds kcov_remote_start/stop() callbacks around the urb complete() callback that is executed in softirq context when dummy_hcd is in use. As the result, kcov can be used to collect coverage from those those callbacks, which is used to facilitate coverage-guided fuzzing with syzkaller. Signed-off-by: Andrey Konovalov --- drivers/usb/core/hcd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index aa45840d8273..de624c47e190 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -1645,7 +1646,9 @@ static void __usb_hcd_giveback_urb(struct urb *urb) /* pass ownership to the completion handler */ urb->status = status; + kcov_remote_start_usb((u64)urb->dev->bus->busnum); urb->complete(urb); + kcov_remote_stop(); usb_anchor_resume_wakeups(anchor); atomic_dec(&urb->use_count); -- 2.25.1.481.gfbce0eb801-goog